I have two questions, in chrome the site looks great (www.ccbenelux.nl/site) but in firefox Vimeo video wont start (upper right) en the logo (in the middle) isn’t correct shown. In IE Vimeo starts but the logo isn’t correct shown.

Try using a preview image for the video. Where you have the video in your featured media, click on the little movie wheel and then select an image to be shown instead of the vimeo player. Then, when a person selects the image it will open up within the browser like the other items and show the video.

When I view the site with Firefox I’m not getting that issue. When I select any of the portfolio items I can navigate between them without any kind of textual or visual error. Is this with a specific version of Firefox or on a something other than a PC running windows 7?

Also just to note, the preview screenshot for any video item automatically has a Play buttom overlay added to it so there isn’t a need to have one in the preview image.